Responding to Valmond’s comment got me thinking about doing some more pre-processing to assist the compression, so here are three more 1KB versions which I think are slightly improved:

• 15% res (same as my original 1KB version) https://files.catbox.moe/f2gvdq.webp
• 15% res, (same as my original 1KB version), but with no tinsel https://files.catbox.moe/4hyvqb.webp (new winner!)
• 20% res (same as my original 2KB version) https://files.catbox.moe/6b4ha1.webp